\textbf{230-} Which of the following statements are correct?
\begin{itemize}
\item[A)] All Arrhenius bases have hydroxide ions ($\mathrm{OH^-}$) in their structure.
\item[B)] The Arrhenius definition for acids or bases is limited to aqueous solutions.
\item[P)] $0.5$ mol of sulfuric acid with $0.8$ mol of sodium hydroxide produces a neutral solution.
\item[T)] The ionization equation of $\mathrm{HNO_2}$ is one-way, but the ionization equation of $\mathrm{HCN}$ is reversible.
\end{itemize}
(1) A, B \qquad (2) B, T \qquad (3) A, T \qquad (4) P, T
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